Scoop elevator



Aug. 22, '1939.

' P. BARTHQLET SCOOP ELEVATOR Filed April 12. 1937 2 Sheets-Sheet 1 Aug. 22, 1939. PI. BARTHOLET SCOOP ELEVATOR Filed April 12, 1937 2- Sheet-Sheet 2 1 w M 1 J W .7 a m 8 8 \J m m W 5 9/ W /H dJ 4 II. I K ,7 a, V y w 1 m 4 a m W I I I HH U n| |n l h .H l i H. l 3 3, l 3 v L,

Patented Aug. 22, 1939 UNITED STATES PATENT OFFICE Application April 12, 1937, Serial No. 136,365 In Switzerland April 28, 1936 6 Claims.

In scoop-elevators of known type one can reckon in general with a scoop-filling of only 40-80%. These elevators further cannot work at high speed, as in this case the filling of the scoops becomes worse, The elevators of known type require much space and are expensive to make only for the reason that two shafts are necessary, mounted at a certain distance the one from the other.

This invention has for its object a scoop-elevator in which a much better scoop-filling is attained than is possible in the elevators of known type, and a much higher conveying speed, so

that for a certain scoop-size much higher emciencies can be attained. The elevator needs less space than those of known type, and is simpler and cheaper to make.

All this is attained, according to the invention, in that the bottom in the elevator foot extends approximately concentric to the axis of the foot disc, at a little distance from the outer edges of the scoops, whereby the clearance between the elevator scoops and the side-walls of the foot is reduced, and further in that the downwardly moving side of an endless conveying band is conducted from the pulley for changing direction, arranged in the elevator head, quite close to the upwardly moving side of the conveying hand, then parallel downwards with this side and again away from the upwardly moving side in front of the element for changing direction in the elevator foot, and that the endless conveying band is mounted in a common shaft, widened in the head and foot-parts.

The drawings show, by way of example, forms of construction of the improved scoop-elevator.

Fig. 1 shows a front elevation of the elevator in section.

Fig. 2 is a side-elevation in section.

Fig. 3 is a cross-section of the shaft (on line II in Figs. 1 and 2).

Fig. 4 is a. part elevation of the belt, drawn to a larger scale,

Fig. 5 shows another form of construction of the elevator for conveying partly in horizontal and in vertical direction.

Fig. 6 is a part cross-section through the horizontal lower reach of the belt.

Fig. 7 shows in plan view and Fig. 8 in top elevation the elevator head with a device for preventing the conveying band from slipping on the head disc.

The elevator comprises, as is shown in Figs. 1 to 4, a single shaft l with enlarged head and foot parts. In the head part of shaft I a head disc 2 and in the foot part a foot disc 3 is rotatably mounted around axles 4, an endless conveying band consisting of a belt or steel-band extends over the discs 2 and 3. On this conveying band 5 scoops are fixed at uniform distances apart. A belt pulley 6 mounted on the axle of the headdisc drives the elevator. Whereas the upwardly moving side of the conveying band 5 extends straight from the foot-disc to the head disc, the downwardly moving side of the conveying band is guided from the head disc 2 first in inclined direction quite near to the upwardly moving side of the conveying band, then parallel to the same and in outwardly inclined direction away from the upwardly moving side to the foot disc 3. Guide bars I and 8, fixed on the side walls of shaft l effect this. guiding of the downwardly moving side of the conveying element. As shown in Fig. 4 the guiding of the conveying band is effected by laterally projecting ends 5 of transverse rods secured to the belt in equidistant relation to each other, the ends 5 engaging the guide bars "I and 8. A partition H) in shaft I prevents collision between the sides of the conveying element moving in opposite directions. Instead of this partition lateral guides ID, as shown in Fig. 3, may be provided. Owing to this guiding of the conveying band, it is poisible to make the cross section of the shaft as small as possible.

The lower end 8 of the guide bar 8 in the elevator foot may be movable and pressed by a spring 9 or similar means against the conveying element to serve thus for automatically regulating the tension of the conveying element.

For better filling the scoops, the bottom I5 in the elevator foot is bent concentric to the axle 4 of the foot disc and extends at a little distance from the outer edges of the scoops, lateral fillings M being further arranged to reduce the clearance between the front edges of the scoops and the bottom IS on the one hand and between the side parts of the scoops and the fillings M on the other hand.

Instead of the fillings I l the side parts of the elevator may be accordingly narrowed at these points.

The two last described arrangements ensure a better filling of the scoops, even if the convey ing speeds are much higher than those employed at present.

Figs. 5 and 6 show a further improvement of the elevator for conveying at the same time in vertical and horizontal or inclined direction.

The elevator foot is extended by a horizontal arm Hi. In this horizontal arm at the end of the same a disc I? is keyed on an axle l8, so that the conveying band is horizontal between the foot disc 3 and disc H. The arm l6 of the shaft may also be inclined instead of being horizontal. In the foot part of the shaft arm I6 and in the foot part of the shaft, in which the downwardly moving side of the conveying element moves, guides 8 and fillings 14 are arranged in the shaft at each side of the elevator scoops, the free arms 8' of the upper guide 8 being pressed by a heavy mass 9 against the conveying element to keep the same stretched.

The fillings i l serve for supporting the conveying belt at both sides, as shown in Fig. 6 and at the same time to ensure a good filling of the scoops.

The elevator-floor is formed of the parts I9, 20 and I arranged at a short distance from the outer edges of the scoops. The inlet 2| for the material to be supplied is so arranged, that the bottom forms a tangent to the floor piece I9.

As shown in Figs. 7 and 8 a device to prevent the conveying element 5 from slipping on the head disc 2 is provided. This impedes elevatorinfiagrations which in many cases are the cause for fires in mills.

Projections 22 on the elevator-head disc 2, projecting from the rim 2 of the disc prevent the conveying element from slipping on this head disc, in that the projecting ends of the transverse rods or of the rolls 5 of the conveying element have to move over these projections. The projections 22 may be so arranged that they yield in a radial direction, and in this instance they are held in their normal projecting position by means of springs 23, centrifugal force or other suitable means. These projections 22 are not normally operative but only become operative in the event of the band binding owing for example to a foreign body becoming wedged between the band and the shaft.

They then engage the projecting ends of the rods on both sides of the conveying element and force the conveying element to continue its circulating movement thereby eliminating the danger of fire due to friction between the conveying element and the elevator head disc.

It might, however, happen that the conveying element runs on to the elevator head disc in such a position that the rod ends are in register with projections 22 with the result that these projections would lift the conveying element off the periphery of the disc, thereby disturbing the quiet running of the conveying element, a

In order to avoid this, the projections 22 are made yieldable in a radial direction with the result that, in the event of the rod ends bearing against the ends of the projections when the conveying element is running on to the elevator head disc, these projections are pressed inwards,

by the rod ends so that the conveying element bears on its entire width against the periphery of the disc 2, and consequently continues to run smoothly.

I claim:

1. A high-speed bucket elevator for granular materials such as grain, mill and similar products, comprising in combination an upper drum, a lower drum, means for rotating the upper drum, an endless. belt on said drums, buckets secured to said belt, transverse rods arranged at distances apart on said belt and projecting from the opposite sides thereof, guide means adjacent the upper and lower drums and bearing against the projecting ends of the transverse rods on the descending run of the endless belt for deflecting the said descending run towards the ascending run whereby the two runs throughout their intermediate portions are caused to travel in relatively close, parallel paths, and a shaft closely surrounding said belt between said drums and widening at its upper and lower ends.

2. In a high-speed bucket elevator as specified in claim 1, the guide means consisting of guide bars arranged with a curve of large radius.

3. In a high-speed bucket elevator as specified in claim 1, the shaft comprising a head, a foot and a vertical portion connecting the head and foot, an inlet on the side of the shaft foot adjacent the descending reach of the belt, lateral fillings in said shaft foot arranged at a short distance from the outer edges of the buckets and which extend partly around the periphery of the lower drum and into the vertical portion of the shaft, the bottom of said shaft foot being in close proximity to the edges of the buckets.

4. In a high-speed bucket elevator as specified in claim 1, the shaft comprising a head, a foot and a vertical portion, a guide pulley in said foot in front of the lower drum and adapted to guide the belt in horizontal direction to said lower drum, and lateral fillings arranged at a short distance from the outer edges of the buckets, extending from the lower drum to the guide-pulley and forming support for the ends of the transverse rods to guide the belt with the edges of the buckets in close proximity to the bottom of said foot.

5. In a high speed bucket elevator as specified in claim 1, radially yieldable elements projecting at intervals from the periphery of the upper drum and adapted to engage the projecting ends of the transverse rods.

6. In a high-speed bucket elevator as specified in claim 1, radially yieldable elements projecting at intervals from the periphery of the upper drum and adapted to engage the projecting ends of the transverse rods, and springs operatively connected to each of said elements for holding the same in its projecting position.

PAUL BARTHOLET. 

